Fountain-pen.



B. KUMAGAI.

FOUNTAIN PEN.

APPLICATION FILED $25. 1916.

Patnted Feb. 26,1918.

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IBUNTARO KUMAGAI, or wmsLow, wasnme'ron.

FOUNTAIN-PEN.

Specification of Letters Patent.

Patented Feb. 26, 1918.

Application filed August 25, 1916. Serial No. 116,816.

new and useful Improvements in Fountain- Pens, of which the following is a specification.

My invention relates to self-filling fountain pens of that class in which an elastic ink. reservoir is contained in a hollow pen holder.

One object of my invention is to provide an improved means of operating the device by which the pen is cleaned, and the reservoir filled.

Another object of my invention is to provide a penholder of a smooth and finished appearance, in which no Part of the selffillin mechanism is left protruding or detacha 1e.

A further object is to provide a simple, durable construction which is eflicient in operation and capable of being manufactured at a comparatively low cost. 7

Other objects will be set forth as my de scription progresses and those features of construction, arrangements and combinations of parts on which I desire protection clearly defined in my appended claims.

Referring to the accompanying drawing, wherein like numerals of reference indicate like parts throughout the several views Figure 1 is a longitudinal section, parts being in elevation, of a pen embodying my invention.

Fig. 2 is a similar view to that shown in Fig. 1, the parts being in an operative position.

Fig. 3 is a fragmentary longitudinal section, parts being in elevation, taken on a plane perpendicular to the views shown in Figs. 1 and 2.

Figs. 4 and 5 are cross-sections taken on lines H and 55 of Fig. 1.

The holder or body is made in sections that when united form one continuous and smooth pen-holder. The principal section 1 is made hollow to contain the ink-reservoir and presser bars.

At one end and screw-threaded in same is a cap or partition 11. The other end is open to admit the insertion of the ink-reservoir and the pen-section 20. Said pen-section is of the type common to self-filling fountain pens, having at its outer end the pen nib 21 and on its inner end the tenon or boss 22 adapted to engage the section 1, and the neck 23 adapted to engage the ink-reservoir 2. Said ink-reservoir is an elastic tube preferably of soft rubber, closed at one end and cemented at the other upon the neck 23 of the pen section, through which section is the usual ink channel and feed-bar connecting the reservoir with the pen.

Withinthesection 1 and between the walls thereof and the ink-reservoir 2 is a pair of presser bars or levers 3, the latter being pivotally mounted in section 1- and adapted to lie one on each side of the reservoir in a diametrically opposite relation.

Bars 3 are connected by a pivot 30, the latter being riveted to section 1 to thereby retain bars 3 in a predetermined position relative to the aforesaid section. Pivot 30 is located at a point near the ends of bars 3 and slightly to the rear of the reservoir 2, dividing said bars 3 into long and short legs.

One of the bars 3 is provided with an opening 32 located in line with pivot 30; the other bar 3 has a reduced portion adapted to seat in said opening when the bars are in an operative position.

The purpose of the opening 32 and the re duced portion on bars 3 is to bring the short legs 31 of the bars in alinement so that they may be properly engaged by a conical head 4:0 to be described later. The bars 3 are retained in their central position on pivot 30 by sleeves or distance pieces 33 disposed on each side of said bars.

In a construction of this kind, bars 3 when in their normal position have the function of a pair of pinchers serving to compress the reservoir 2 when it is deemed desirable to fill the same, substantially as shown in Fig. 2.

Section 5 which is screw-threaded in one end of the section 1 contains a blotter attachment which forms no part of my present invention, but which is fully described in my co-pending application, filed June 22, 1916, Serial No. 105,144; a simple description of the latter is all that is thought to be necessary.

The blotter element B is wound on a spool 6, the latter being rotatably mounted in section 5. A spring serves to retain the blotter element B in a normally retracted position, the inner end of said spring being attached to a boss 61 of spool 6, while the outer end is fixed to the wall of chamber 50 of section 5.

Blotter element B is attached on its inner edge to spool 6 as by hooks 60, and on its outer edge has the usual metallic strip, the latter having a finger-engaging lug- 65 to facilitate the removal of blotter element from the chamber 50.

An outer cap 7 is threaded on the outer end of section 5, said cap having'an axial aperture 70 for the reception of the outer end 42 of a stem 4.

For the protection of the pen point, and as an extension of the holder, I provide the cap C in common use on fountain pens.

A stem 4 is mounted for axial movement in partition 11, section 5 and spool 6. A conical head 40 is formed on the inner end of stem 4, the latter being adapted to normally engage legs 31 of bars 3.

A spring 41 mounted on stem 4 near its inner end bears against the partition 11 and a shoulder 42 of said stem. This spring serves to retain stem 4 in its retracted position.- Conical head 40 abuts partition 11,

thereby limiting the axial movement of said stem.

The construction and arrangement of parts having thus been described, it is thought that the method of cleaning and filling the pen will be readily understood.

In filling or cleaning, the pen is positioned substantially similar to that shown in Fig. 2, the pen point being placed in ink or water, as the case may be. The point of a pencil or other device L is inserted into aperture 70, engaging the outer end 43 of stem 4. Pressure is then applied to the latter, thereby compressing spring 41 while conical head 40 spreads the short legs 31 of bars 3 simultaneously bringing'the long legs of the said bars together, and compressing the ink-reservoir 2 expelling the air or the liquid therein contained.

The ink-reservoir relieved from pressure expandssand fills with ink, thereby return ing presser bars 3 to their normal inopera tive position, while spring 41 returns stem 4 to a similar position.

By reason of the fact that the barrel is imperforate, or Without openings of any kind in its sides, even should the ink-reservoir leak, the ink cannot find its way out of the barrel to soil the hands and clothing.

Although I have shown this particular form, I Wish it to be understood that my device may be applied to the cheapest grade of pens on the market, that being my present intention to do.

Having thus described my invention, what I claim as new and desire to secure by Letters-Patent of the United States, is-

1. A fountain pen comprising a barrel, a nozzle at one end thereof, a pen nib disposed in said nozzle, a flexible ink-sack connected with said nozzle, a feeder extending through the nozzle from the ink-sack to the pen nib, a presser-bar pivotally mounted in said barrel and adapted to engage said ink-sack, a stem mounted for axial movement in said barrel, said stem having a conical head on one end thereof, the latter being adapted to normally engage the aforesaid presser bar to operate same, and spring means carried by said stem to retain same in a retracted position.

2. A fountain pen comprising a barrel, a flexible ink-sack therein, a pair of pivotally connected presser bars arranged to embrace said ink-sack, and means for actuating said presser bars to compress said ink-sack, said means comprising a stem movable axially in gaid barrel and engaging both of the presser ars.

3. A fountain pen comprising a barrel, a flexible ink-sack therein, a pair of pivotally connected presser bars arranged to embrace said ink-sack, means for actuating said presser bars to compress said ink-sack, said means comprising a stem movable axially in said barrel and engaging both of the presser bars, and means for yieldingly retaining the aforesaid means in its inoperative position.

4. Ina fountain pen, a flexible ink-sack, a pair of presser bars pivotally connected intermediate their lengths to afford long and short arms for the respective bars, the long arms being disposed at diametrically opposite sides of said ink-sack, and means engageable with said short arms whereby the ink-sack may be compressed through the agency of the long arms.

In testimon whereof I afiix my signature in presence 0 two Witnesses.

BUNTARO KUMAGAI.

. Witnesses:

HORACE BARNES, A. L. BOWEN. 

